add unload methods
add utility method to determine protocol descendankts
fix #608: Clicking on the filter icon in the tree of the data explorer does not open the filter dialog
fix the test
Merge pull request #694 from bartcharbon/master

Importer changes: Moved entity options to different screen, and by default hide them
add catalog meta data
Merge pull request #696 from dennishendriksen/master

fix #608: Clicking on the filter icon in the tree in the data explorer + catalog loader stuff
changed the test
Merge pull request #695 from RoanKanninga/master

fix the test
Bugfixes